Buggy code:
public class Parser { private Symtab symtab = new Symtab ( ) ; TK [ ] f_declaration = new TK [ ] { TK . VAR , TK . CONST , TK . none } ; TK [ ] f_var_decl = new TK [ ] { TK . VAR , TK . none } ; TK [ ] f_const_decl = new TK [ ] { TK . CONST , TK . none } ; TK [ ] f_statement = new TK [ ] { TK . ID , TK . PRINT , TK . IF , TK . WHILE , TK . FOR , TK . REPEAT , TK . none } ; TK [ ] f_print = new TK [ ] { TK . PRINT , TK . none } ; TK [ ] f_assignment = new TK [ ] { TK . ID , TK . none } ; TK [ ] f_if = new TK [ ] { TK . IF , TK . none } ; TK [ ] f_while = new TK [ ] { TK . WHILE , TK . none } ; TK [ ] f_for = new TK [ ] { TK . FOR , TK . none } ; TK [ ] f_repeat = new TK [ ] { TK . REPEAT , TK . UNTIL , TK . none } ; TK [ ] f_expression = new TK [ ] { TK . ID , TK . NUM , TK . LPAREN , TK . none } ; private Token tok ; private void scan ( ) { } private Scan scanner ; Parser ( Scan scanner ) { } private static final int initialValueEVariable = 8888 ; private static final int initialArrayElemValue = 4444 ; private void gcprint ( String str ) { } private void gcprintid ( String str ) { } private void bc ( ) { gcprint ( "int<seq2seq4repair_space>bc(char<seq2seq4repair_space>*arrayName,<seq2seq4repair_space>int<seq2seq4repair_space>*array,<seq2seq4repair_space>int<seq2seq4repair_space>index,<seq2seq4repair_space>int<seq2seq4repair_space>lno)<seq2seq4repair_space>{" ) ; gcprint ( "int<seq2seq4repair_space>curSize<seq2seq4repair_space>=<seq2seq4repair_space>array[1];" ) ; gcprint ( "int<seq2seq4repair_space>ub<seq2seq4repair_space>=<seq2seq4repair_space>array[1]<seq2seq4repair_space>+<seq2seq4repair_space>array[0]<seq2seq4repair_space>-<seq2seq4repair_space>1;" ) ; <START_BUG> gcprint ( "if(index<seq2seq4repair_space><<seq2seq4repair_space>0<seq2seq4repair_space>||<seq2seq4repair_space>index<seq2seq4repair_space>><seq2seq4repair_space>ub)<seq2seq4repair_space>{" ) ; <END_BUG> gcprint ( ( "fprintf(stderr,\"subscript<seq2seq4repair_space>(%d)<seq2seq4repair_space>out<seq2seq4repair_space>of<seq2seq4repair_space>bounds<seq2seq4repair_space>for<seq2seq4repair_space>" + "array<seq2seq4repair_space>%s[%d:%d]<seq2seq4repair_space>on<seq2seq4repair_space>line<seq2seq4repair_space>%d\"," ) ) ; gcprint ( "index," ) ; gcprint ( "arrayName," ) ; gcprint ( "array[0]," ) ; gcprint ( "ub," ) ; gcprint ( "lno" ) ; gcprint ( ");" ) ; gcprint ( "exit(1);" ) ; gcprint ( "}" ) ; gcprint ( "else<seq2seq4repair_space>{" ) ; gcprint ( "return<seq2seq4repair_space>1;" ) ; gcprint ( "}" ) ; gcprint ( "}\n" ) ; } private void program ( ) { } private void block ( ) { } private void declaration ( ) { } private void var_decl ( ) { } private void var_decl_id ( ) { } private void arrayInit ( String arrayName , int arraySize , int lb ) { } private void const_decl ( ) { } private boolean const_decl_id ( ) { } private void statement ( ) { } private void assignment ( ) { } private void print ( ) { } private void ifproc ( ) { } private void whileproc ( ) { } private void forproc ( ) { } private void repeatproc ( ) { } private void expression ( ) { } private void expression2 ( ) { } private void simple ( ) { } private void term ( ) { } private void factor ( ) { } private Entry lvalue_id ( String id , int lno ) { } private void rvalue_id ( String id , int lno ) { } private boolean is ( TK tk ) { } private void mustbe ( TK tk ) { } boolean first ( TK [ ] set ) { } private void parse_error ( String msg ) { } }

Fix:
gcprint ( "if(index<seq2seq4repair_space><<seq2seq4repair_space>array[0]<seq2seq4repair_space>||<seq2seq4repair_space>index<seq2seq4repair_space>><seq2seq4repair_space>ub)<seq2seq4repair_space>{" ) ;